Chemical stabilization of demolition wastes in pavement bases using one–part fly ash and slag based geopolymers

•A novel one – part geopolymer technology for stabilizing pavement base.•Activation of geopolymer reactions using solid sodium hydroxide at various ratios.•Fly ash and slag as sustainable precursor for improved cementitious products.•Compressive strength of soil mixtures at different precursor dosages and curing conditions.•Stabilization of C&D materials with one-part geopolymer can produce good strength overall for pavement base/subbase applications.